A singularity in a black hole is a point of infinite density and zero volume at the center of a black hole. It is where the laws of physics, as we know them, break down.
No, we cannot observe a singularity directly as it is hidden behind the event horizon of a black hole. The event horizon is the point of no return where the gravitational pull is so strong that nothing, not even light, can escape.
A singularity forms in a black hole when a massive star collapses under its own gravity. As the star's core collapses, it reaches a point where the gravitational pull is infinitely strong, forming a singularity.
No, once an object crosses the event horizon of a black hole, it is trapped and cannot escape. This includes light, which is why black holes are invisible.
At the singularity, the laws of physics as we know them break down, and our current understanding of space and time no longer applies. It is a point of infinite density and infinite curvature, where all matter is compressed into a single point.